Push bar for pushing a stuck vehicle

ABSTRACT

The invention relates to a device using force of one or several persons comprising a lever arm which consists of a bar ( 1 ) and an effort transmission triangle ( 1.2 ) and points fixed to a ground for pushing the vehicle rear part ( 1.4 ) in such a way that it is moved from mud. Said fixed points are formed by blocks ( 2 ) inserted under the wheels and anchored to the ground by the vehicle weight. The inventive device essentially comprises a main bar ( 1 ) consisting of abutment elements ( 1.1 ), a triangle ( 1,2 ) provided with end rings ( 1.7 ), a laddle ( 1.6 ) resting on the ground, straps or cables ( 1.9 ) tensioning the bar in such a way that it operates under tension, a joint and a vehicle hooking point ( 1, 4 ), strips, rods and blocks. The blocks ( 2 ) are placed before the wheels and are connected to the rings of the triangle through the connecting rods ( 3 ) and strips ( 3,6 ). The bar lifting force is transformed into a rear push and the vehicle progression. Variants using in particular strainer or hoist mechanisms provided with specifically shaped bars or doubled by the bar for producing a pushing force are also disclosed.

TECHNICAL FIELD

This invention relates to a system that helps a regular or all tracks vehicle recover from a situation where its wheels are stuck in sand, mud, snow, ice or any other sort of soft and slippery track. The word stuck refers here to the ideas of penetration of the wheels in the soil and of lack of traction of the wheels on the track material.

BACKGROUND ART

It is known in the vehicle art to provide traction blocs to function as support and anti skid devices for a traction wheel on a vehicle, to use shovels to free the vehicle, to pull with a winch and a cable attached to a fix point, to use special tyres or chains in the case of snow or even to reduce the tyre pressure to increase its contact surface and grip.

Alternatively we can also pull or push the vehicle by means of another vehicle, animals or men. The main drawback of these solutions is that they require means like a strong fix anchoring point, some storage capacity for the blocs, the availability of other vehicle, men or animals for pushing, and also that “flattening” tyres is not recommended and there can be accidents when pushing or pulling a vehicle. These solutions do not prevent from another problem further down on the track. Their effects are very limited in space.

DISCLOSURE OF THE INVENTION

In accordance with the present invention, the system will overcome all these drawbacks.

It consists of a bar used to push the vehicle outside of the track holes, in combination with part of the vehicle weight that helps forming a fix point and with the strength of one or several men.

Alternatively a manual or electrical winch can be used instead of the men's strength.

It can also allow the mounting around the wheels of systems that will prevent getting stuck again. The standard arrangement consists laying in front of each vehicle's wheels a chain of anti-skid blocs connected together with cables and of which the front extremity is connected by straps or cables towards the back of the vehicle to the triangular part of a bar swivelling around the trailer coupling point.

The triangle is in a plane more or less perpendicular to the direction of the bar and the hooking points of the straps are under the bar level. Lifting the bar from its horizontal position makes these hooking points move away from the vehicle, then pulling on the anti-skid blocs while the bar pushes the trailer coupling point, all of this creating a relative move of the vehicle on top to the anti-skid blocs which then form a fix point as they get anchored to the ground by the load, allowing now the vehicle to move forward in relation to the ground and forming a new solid track for the moving vehicle.

There are different possible configurations for the bar according to the ratio of force to movement to obtain. It is also possible to replace the lever effect of the bar by the pull of a winch fixed to a part of the bar fixed to the car rear part or directly to the rear car structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. N^(o) 1 represents the general principle of the push bar according to the first arrangement. Bar with its components (1.1), triangle (1.2), pins (1.3), fixing assembly to the vehicle (1.4), handles (1.5), shovel or ladle (1.6), triangle ends rings (1.7), and a set of bar straps or cables (1 9), set of blocs (2) connecting rods (3), and set of connecting straps (3.6).

FIGS. N^(o) 2 and 3 represent anchoring points of the bar to the rear part of the vehicle according to the first arrangement.

FIG. N^(o) 2, flat end of the bar (1.4.1), connecting pin (1.4.2) to the vehicle trailer coupling device, main connecting assembly (1.4 a) with safety pin (1.4.3 a).

FIG. N^(o) 3, flat end of the bar (1.4.1), connecting pin (1.4.2) to the rear bumper assembly, main rear bumper assembly (1.4 b) with connecting system (1.4.3 b).

FIG. N^(o) 4 represents the side view of a bar according to the third arrangement. Bar elements (1.1) with triangle (1.2) shown in low and high positions. The travel A is optimised for an angle between around −30 et +30°.

FIG. 5 represents a bar with rings and straps according to the fourth arrangement. Standard bar with ring (1.8) and strap (1.15) shown in low position with strap attached to the car roof, in high position with strap attached to the car roof, and in high position with strap attached at the front of the vehicle.

FIG. 6 represents a bar with strap winch according to the fifth arrangement. Bar with elements (1.1), triangle (1.2) reinforced in horizontal plane by bracings, triangle end rings (1.7), shovel (1.6), and strap winch (1.10).

FIG. 7 represents a bar with articulated triangle according to sixth arrangement. Bar with elements (1.1), triangle (1.2), pins (1.3), anchoring point on the vehicle (1.4) the handles (1.5), the shovel (1.6), the triangle end rings (1.7), a winch (1.10) and a set of straps or cables (1.9) and (3.6), 4 sets of anti-skid blocs (2), connecting system of the blocs to the bar (3). In detailed drawing, the pivot with axle (1.11), the triangle (1.2), the guide bar of the triangle (1.12) with holes as shown to introduce the one way pin (1.12 a) or the two ways pin (1.12 b).

FIG. 8 represents a bar with idler pulleys fixed on the triangle according to seventh arrangement. Bar (1), blocs (2), connecting system to the blocs (10), idler pulley (4 a), straps (1.9) and (3.6).

FIG. 9 represents a bar with idler pulleys fixed on the connection system according to the eighth arrangement. Bar (1), blocs (2), connecting system to the blocs (10), idler pulley (4 b), straps (1.9) and (3.6).

FIGS. 10 and 11, represent a double bar according to the ninth arrangement.

FIG. 10, top half bar (1.1 a) with its half triangle (1.2 a) and lower half bar (1.1 b) with its half triangle (1.2 b), connecting rings between the two half bars (1.8) and set of straps and buckles (1.15).

FIG. 11, Detailed drawing of the triangle pivot, axel (1.2 a) located inside the other triangle hub (1.2 b), two enclosing pins (1.13), a vertical thrust pin (1.14).

FIG. 12 represents a short bar with idler pulleys fixed at triangle ends according to the tenth arrangement. Short bar with elements (1.1), shovel (1.6), ring (1.8), reinforced triangle (1.2), idler pulleys with bearing (5), winch (1.10), straps (1.9) and (3.6).

FIG. 13 represents a system with permanent rings according to the eleventh arrangement. Rings (6), connecting pivot of permanent rings to the vehicle structure (7), double wind winch (8) with winch wheel (8.1), non return system (8.2), winch drum (8.3) with strap holding slots, base plate on the vehicle (8.4), straps (3.6).

FIG. 14 represents a system with winch according to the twelfth arrangement. Pads (2), linkage system to the blocs (10), straps (3.6), winch (9) with its drum (9.1), fixing system to the vehicle (9.2), wheel for cable change of direction (9.3), crank (9.4) and transmission system (for example worm system) (9.5).

FIGS. 16 and 17 represent two different linkage systems to the blocs according to the first and thirteenth arrangements.

FIG. 16 arched rods system with inside rod (3.1) and outside rod (3.2), spigots or connecting system to the blocs (3.3), small bar (3.4), connecting spreader to the strap (3.5).

FIG. 17, adjustable connecting bar (10), with back part (10.1) and ring or linking spigot to the blocs (10.4), front part (10.2) and linking ring to the strap (10.5), adjustment pin (10.3).

FIGS. 18 and 19 represent two connecting systems to the blocs according to the fourteenth arrangement.

FIG. 18 blocs system with blocs (2.1), connecting elements (2.2), hooking device in the form of ring or linking spigots to the connecting part (2.3), fix ploughshare (2.4).

FIG. 19, blocs system with blocs (2.1), connection elements (2.2), hooking device (2.3) pivoting ploughshare (2.5). The first bloc ploughshare is shown open, the second one is not.

FIG. 20, represents a anti-skid (pad) system according to la fifteenth arrangement. Rubber strip (2.6) seen from underneath, with ring (2.3).

FIG. 21 represents a non return system according to the sixteenth arrangement. Non return system (11) with base plate (11.1), lever (11.2), rotation free connecting part to the vehicle structure (11.3), ploughshare (11.4) shown in open and close position.

FIGS. 22 and 23 represent different types of tighteners and straps with standard locking buckles according to the previous arrangements.

FIG. 22 ratchet webbing tightener (12) for loads from 500 to 3500 daN according to size.

FIG. 23, type of stowing strap (13) with self locking eccentric type buckle (14 a).

FIG. 24, type of stowing strap (13) with self locking lever type buckle (14 b).

FIG. 25 shows the different phases of the pushing action using the double bar according to ninth arrangement.

Vehicle Positions

A starting point, the half bars are apart, the car rear wheels are on line A

B middle position, the half bars are brought together, the car rear wheels are on line B, 0.5 m further from line A.

C final position when bars are crossed, car rear wheels are on line C, 0.8 m further from line A.

D final position when bars are lifted, car rear wheels are on line D, 0.8 m further from line A.

With Reference to These Drawings, the System Includes the Following List of Items

(1): push Bar.

(1 a) and (1 b): two halves of the double bar.

(1.1): elements of the main beam of the bar.

(1.2): triangle of the bar.

(1.2 a) and (1.2 b): the different parts of the triangles of the two halves of the double bar.

(1.3): connecting pins to the different bar elements.

(1.4): fixing assembly to the vehicle.

(1.4 a): fixing point of the swivel end of the push bar to the trailer coupling device of the vehicle.

(1.4 b): main rear bumper assembly.

(1.4.1): flat end of the bar.

(1.4.2): connecting pin.

(1.4.3 a): safety pin.

(1.4.3 b): connecting system.

(1.5): handles.

(1.6): shovel.

(1.7): triangle end rings.

(1.8): ring.

(1.9): bar straps or cables.

(1.10): winch (type webbing tightener with ratchet or other compact type).

(1.11): triangle pivot with axle.

(1.12): triangle guide bar.

(1.12 a): one way pin.

(1.12 b): two ways pin.

(1.13): enclosing pins

(1.14): vertical thrust pin.

(1.15): linking straps.

(2): set of anchoring blocs (or anti-skid blocs).

(2.1): blocs

(2.2): blocs connecting elements.

(2.3): hooking devices to attach the connecting system.

(2.4): fix ploughshare.

(2.5): pivoting ploughshare.

(2.6): rubber strip.

(3): connecting system.

(3.1): inside rod.

(3.2): outside rod.

(3.3): spigot or connecting system to the blocs.

(3.4): small bar.

(3.5): connecting spreader to the strap.

(3.6): straps (between blocs and triangle).

(4 a): idler pulley (triangle side).

(4 b): idler pulley (connecting system side).

(5): idler pulley with bearing (fixed at triangle end).

(6): permanent rings (vehicle rear structure)

(7): connecting pivot of permanent rings.

(8): double wind winch.

(8.1): winch wheel.

(8.2): non return system (of the winch).

(8.3): winch drum (with straps holding slots).

(8.4): winch base plate.

(9): winch.

(9.1): winch drum.

(9.2): winch fixing system to the vehicle.

(9.3): wheel for cable change of direction.

(9.4): winch crank.

(9.5): winch transmission system.

(10): adjustable connecting bar.

(10.1): back part of the adjustable connecting bar.

(10.2): front part of the adjustable connecting bar.

(10.3): pin.

(10.4): ring or linking spigot to the blocs.

(10.5): linking ring to the strap.

(11): vehicle non return system.

(11.1): non return system base plate.

(11.2): non return system lever.

(11.3): rotation free connecting part to the vehicle structure

(11.4): ploughshare.

(12): ratchet webbing tightener.

(13): stowing straps.

(14 a): self locking eccentric buckle.

(14 b): self locking lever buckle.

BEST MODE FOR CARRYING OUT THE INVENTION

According to a first arrangement, the invention consists of a set of elements positioned around the vehicle and used in the standard procedure described underneath: A push bar for pushing a stuck vehicle (1) with its components:

-   -   bar elements (1.1), the triangular part called the triangle         (1.2), pins connecting the various bar components (1.3), a         connecting system to the car bumper or to the trailer coupling         system (1.4), handles (1.5), a shovel (1.6), a set of straps and         buckles (1.9) that can be of a standard type (13 and 14 a or 14         b),     -   four sets of anti-skid or supporting blocs (2) that will each         form a fix point and a supporting track for the vehicle;     -   four sets of connecting systems between the push bar and the         anti-skid blocs comprising each: two rods (3.1 et 3.2), with         spigot (3.3) on the blocs side and a small connecting bar (3.4)         and a spreader on the other side (3.5) to connect the rods to         the straps (FIG. 16);     -   four sets of stowing straps (3.6) with self locking buckles that         can be of standard type (13, 14 a or 14 b) and hooks.

The system is designed to be easily and quickly operated and to be easily stored in the vehicle trunk. It is of adequate dimensions and weight. For that purpose, the bar structures will work as much as possible under direct compression and will have shapes to avoid buckling and bending.

The straps work under traction conditions and the triangles and other bracings optimise the design to take advantage of these combinations.

Standard Procedure for Setting and Using the Push Bar

General. The principle consists in the use of:

-   -   fix points created by the blocs loaded and anchored into the         ground by the weight of the stuck vehicle,     -   a special push bar acting as a lever,     -   and the strength of men.

Once anchored into the ground, the blocs will virtually not move. The system leverage will vary within a range of 10/1 to 2/1, creating for each operation a vehicle move of between 0.2 and 1.0 metre. The differences come from the different possible arrangements and types of push bars that are in fact chosen according to the vehicle weight, number of men available and the depth in the sand of the stuck vehicle.

The procedure is described for a 4 wheels vehicle and for the standard push bar configuration.

Positioning of the System

The operator deploys on both sides of the vehicle and just ahead of the front and rear wheels a chain of blocs connected to each other by the blocs connecting elements (2.2). The 4 chains of blocs (2) are straight, in wheels axis and their concave face is on top. Les 2 arched rods (3.1 and 3.2) of each connecting system (3) will be positioned behind each wheel and the extremity of the inside rod (3.1) will be dug into the sand to reach the front side of the wheel and then its spigot (3.3) hooked to the small bar (3.4) and the first bloc (2.1) as soon as the outside rod (3.2) is laid along the outside face of the same wheel and also connected to the same small bar and first bloc. The arched shape of the inside rod helps reaching the front of the wheel by going underneath the sunk parts of the car and popping off the sand on the other side.

Once the 4 chains of blocs are connected to the connecting systems (3), the operator checks that the first blocs are in line with their wheel, fastens the straps (3.6) to the connecting spreader (3.5) ring and leads the straps free extremities to the rear of the vehicle (alternately, the front wheel strap is attached to the front end of the rear wheel chain of blocs in the serial arrangement of the system). These straps extremities will later go through the triangle end rings (1.7) or be attached to the rings or to the straps (1.9) going through these rings.

The bar is deployed behind the car and in its main axis. The bar length is in general around 3 m, but can vary from case to case. All bar components have been previously put together: main bar elements (1.1), triangle (1.2), shovel (1.6), handles (1.5) and other pins (1.3), bracings and straps (1.9). The bar front extremity is assembled to the rear car bumper or to the trailer coupling system by its fixing assembly to the vehicle (1.4). The type of assembly allows some free rotation in both horizontal and vertical planes.

Pushing phase. Once the system is set, the lifting of the bar at handles (1.5) level will induce a relative move of the vehicle onto the 4 chains of blocs which will then act as fix points for this <<lever>> system. Lifting the bar 1 m will induce a car move of around 0.1 m, it may be necessary to repeat the move several times taking precautions to keep the straps under tension and prevent the car from going back into the holes by filling them, having some one using the car brakes or using a non return system. Instead of lifting upwards, one can also rotate the bar in the horizontal plane and use the pull action of one long side of the triangle on the one side of connecting straps. In this case, the movement to force ratio is increased and the push force is reduced.

Once the vehicle is free, the operator disconnects the bar elements and stores them in the trunk.

Detailed description of the bar: the push bar (1) is made of light elements (1.1) such as hollow pipe of individual length of 1 m, diameter and wall thickness of around 50 and 5 mm. These dimensions are only approximate and vary according to the materials which are generally steel, aluminium, even glass or carbon fibre, according to the push forces to generate and of the actual bar arrangement used. The elements ends are fit together in order to form the bar and are secured by pins (1.3) introduced into the adequate holes. The gap between inside and outside diameters is reduced in order to avoid buckling effects. The front end of the bar is made of a flat piece (1.4.1) with a horizontal hole. This shape and the associated pin (1.4.2) are designed to connect the bar to the fixing assembly (to the vehicle being in turn mounted on the trailer coupling device of the car or the rear bumper assembly (1.4, 1.4 a or 1.4 b). The hole and pin (1.4.2) of the flat piece allow vertical free rotation of the bar, as well as some free movement in the horizontal plane by use of short guide length and big construction gaps. The pin has a locking system.

The triangle (1.2) is also located at this side of the bar. The triangular shape is designed to allow the transmission of pulling forces away from the bar main axis and the different bracings avoid collapsing of the assembly under such forces.

In the standard arrangement, the triangle is located in a plane perpendicular to the bar axis and its total width is around 1.5 m. The triangle end rings (1.7) are then located slightly on the outside of the wheels and at a level around 0.3 m underneath the bar level when the bar is connected to the car bumper at in horizontal position.

The intersection points of the bar and triangle elements are either made by special parts into which the elements ends are fitted or by pin or bolts assembly of these element ends.

The fixing assembly (1.4, 1.4 a or 1.4 b) to the bumper or the trailer coupling ball of the vehicle transmits the pushing force of the bar to the vehicle. It also transmits forces in other directions, in particular downwards. According to the trailer coupling shape and the available space around it, it is possible to assemble the bar directly by means of a swivel coupling. In most cases an intermediate part is required. If the vehicle is not previously equipped with a trailer coupling, the main rear bumper assembly will cover the bumper and will form a rigid structure that will spread the push force evenly over a great surface to avoid punching effects. If the bumper is not strong enough, this assembly will be extended to car chassis. The assembly will be secured onto the bumper with easy to use fasteners (1.4.3 b).

On the operator side, the bar can have lifting handles (1.5) made a piece of pipe around 400 mm long and 25 mm in diameter. They go through the main bar element and ease the lifting process for two operators.

The shovel (1.6) has a runner shaped surface on which the bar can rest without touching the ground or slide easily when the system moves forward.

The straps transmit the pulling forces of the bar to the blocs. They are made of materials that are as little elastic as possible to avoid accumulation of energy and associated risks for the operator and to maintain a direct and instantaneous conversion of the lifting movement into the car translation movement. For the standard assembly, the set of straps linking the blocs the back end of the bar can be attached or not to the triangle end rings (1.7). When they are not attached, the triangle must haves bracings with a component in the direction of the bar main axis (that is to say with a triangular shape in a plane view). These straps ends are equipped with self locking buckles (14 a or 14 b) that allow adjustment of the length, of the gaps or fastening of straps together. Their friction against the rings will be minimal and their flexibility as good as possible. They are made of synthetic woven material for the stowing strap type (13) or high tensile strength steel for the cable type. The forces on theses straps or cables vary according to the arrangements and vehicle characteristics in a range from 500 to 2000 daN.

Detailed Description of the Chains of Blocs (FIGS. 18 and 19)

The blocs ((2.1) have a <<U>> shape with dimension width slightly wider than the tyre width. They are connected to one another by means of blocs connecting elements (2.2) to form a chain. These connecting elements are flexible of cable, chain, strap or other type and allow for freedom so that the blocs can be stored and manipulated easily and can copy the track profile as well as transmit the pulling forces.

The pulling force can be limited to the traction of one chain of blocs or can correspond to the force of two chains of blocs for the serial arrangement, that is to say for the arrangement where le front wheel connecting element is attached two the rear wheel chain of blocs.

The quantity of blocs included in each chain is such that when deployed, they provide a supporting track long enough to guide the vehicle until it is totally free. The standard number varies from 4 to 8 blocs. The individual bloc length, width and thickness are such that they allow a good support on the ground and under the vehicle wheel while sinking deep enough under the vehicle weigh to become a good anchoring point. They also form a thick track that lift up the car a little bit and can avoid contact of the lower part of the car to the ground.

The “U” wings guide the tyre or align the blocs to the tyre. For some arrangements, the anchoring capacity of the blocs can be improved (see FIGS. 18 and 19). The blocs are made of light material such as plastic, light alloys, wood, hollow steel profiles, hollow alloy castings.

Detailed Description of the Connecting System (3) (see FIG. 16)

The inside and outside rods (3.1 and 3.2) are made of spring steel. Their length is around 1 m and diameter of around 5 mm. They are slightly arched and have good pulling capacity, are easy to store and are easy to install during manoeuvres around the stuck wheel (from back of the tyre to front and going under wheel axle). On the blocs side they each have a hooked end or spigot (3.3) which with small removable connecting bar form the connecting system linkage to the first bloc. On the other side the end ring of each rod is attached to a spreader (3.5) that insures the connection of the rods to the straps.

According to a second arrangement, the push bar elements are made of tubular profiles that can fit inside one another for reduced storage volume. For instance, during storage phase, the elements at the operator's end will be of smaller diameter and can be put inside the centre elements which in turn can be put inside the elements of the car side and can also accommodate the triangle tubular elements. For operating phase, the connection between all these different diameters elements is made by screw or pin systems. This arrangement also allows the use of bigger diameters where they are needed to avoid buckling, and without increasing the storage volume.

According to a third arrangement, the triangle will be tilted forward in order to increase the movement of the car for the same lift. With the standard arrangement, when the bar is lifted to an angle over 30°, the rotation of the triangle end rings produces smaller move for each additional lift. With the third arrangement, the reduction of move is less.

According to a fourth arrangement, a ring (1.8) will be fitted to the bar near the handles to possibly connect the bar to top of the vehicle. The strap connecting the ring to the roof will form a close loop with length adjusted by a locking buckle (1.15). Le purpose of this arrangement is to maintain the lifted position of the bar by tightening this loop and so preventing the car from going back into the hole.

It is also possible to pull on this strap in order to lift the bar. Due to the fact that the strap is doubled when forming the loop but acts only up to the ring level the pulling effort of the operator is more or less equivalent to the pulling effort. However, with this arrangement, the bar works more under bending condition.

If the fix point on the top of the car is replaced by a point on each side of the front bumper it is also possible to pull the straps from these points and lift the bar to vertical position.

According to a fifth arrangement, the triangle is reinforced and the straps or cable simply slide inside the triangle end rings. It is then possible to create the pulling on the straps and the car movement by action on a tightener or a winch (1.10) located at the back end of the bar. The bar will remain in horizontal position and will slide on its shovel (1.6). This arrangement allows for safe pushing of heavy vehicles. Here, the bar is used only as a means to locate the pulling device far behind the rear wheels, to have the direction of the pulling forces almost parallel to the movement and to transfer the only important efforts to the vehicle on its trailer coupling device. One can use the manual winches from around 500 daN to 3500 daN or electrical winches. The use of winches can also be combined (but not simultaneously) to a lifting of the bar. The bar length can be reduced in that case (2 to 3 m).

According to a sixth arrangement, the triangle can pivot inside a vertical guide (1.11) located next to the front side of the bar, immediately under the main bar element, and the straps (3.6) are attached to the triangle end rings. The straps (3.6) coming from the front wheels can be attached to the straps (3.6) coming from the rear wheels to the same triangle end ring, or to another triangle ring located near the end ring if the front wheel straps come from the inside of car bottom. In that case, the straps going to the winch are attached to news ring located in between the two previous ones, minimizing the different forces applied on the triangle. The triangle acts only as a spreader that keeps the distances between straps each side of the vehicle.

It is then the action on the tightener or winch (1.10) located at the back end of the bar that induces the car move. The free rotation of the triangle allows for a move of around 400 to 500 mm for an angle between position 45° forward and 90° backwards. The arrangement also allows the standard use of the bar for a triangle position between around −45 and +45°. In order to optimize the move and adjust the height of the triangle, there is system that guarantees a minimum height without limiting it and even letting the triangle get loose out of the guide (1.12). This is obtained by inserting the pin (1.12 a) at the top of the central guide when pin (1.12 b) is not inserted. During the pushing operation, the bar will slide on its shovel (1.6).

This arrangement provides a long move and a secure push of a light or heavy vehicle by only one operator. Again, the bar transfers the traction point far behind the car wheels in order to get forces in a parallel direction to the wheels axis and transfers important forces to the car bumper or trailer coupling device. Manual winches from 500 daN to 3500 daN or electrical winches can be used.

To operate the bar in its lifting configuration, it is necessary to insert pin (1.12 b) in the only hole of the central tube of the pivot and in one of the tubular guide (1.12) holes. This tubular part is therefore drilled with holes (for pins (1.12 a and 1.12 b) at intervals and in two perpendicular directions.

According to a seventh arrangement (FIG. 8), les straps of the wheels at each side will go around the wheel of an idler pulley (4 a) which is attached to the end ring of the triangle and then their free end will be fastened to a fix point on the vehicle structure (jack lifting point or hook on the chassis . . . ). Going through the idler pulley will practically double the car move for the same bar lift as the standard arrangement, and will practically reduce by half the pushing force for the same effort on the bar. The idler pulley can be replaced by a small drum free to rotate in a long triangle en ring or even by the ring itself if the straps and ring materials and surface have reduced friction.

According to an eighth arrangement (FIG. 9), the idler pulley (4 b) is located at the connecting system (3) spreader (3.5). One end of the straps (3.6) is fastened to the triangle end rings while the loose end go through the pulley wheel and is fastened to a fix point of the car. Going through the idler pulley will practically reduce by half the car move and double the pushing force s compared to the standard arrangement. Similarly, the pulley can be replaced by a drum or even the ring itself

According to a ninth arrangement, the bar is divided into two halves (1.1 a and 1.1 b), (FIG. 10 et 11). The two halves are free to rotate in a horizontal plane around an axis located at the triangle level. Their respective back ends are provided with a ring (1.8), and a strap with self locking buckle (1.15) forms a loop that joins these two rings.

One half bars (1.1 b) is located slightly underneath the other one (1.1 a), the horizontal element of its halt triangle (1.2 b) is located slightly above the other one's, and its vertical element is open with slightly bigger dimension than the other half triangle vertical element, so that the smaller diameter can fit inside the bigger one and rotate freely as soon as the open shape is closed by enclosing pins (1.13) or bearings. A vertical thrust is also added to this vertical element to stop any relative axial move.

This arrangement provides a big move of the vehicle. The starting position is a position where the two halves are horizontal and spread apart, then joining the two halves by rotating them towards the middle axis. During the phases of horizontal rotation of the half bar, the leverage is according to the ratio of half bar radius to half triangle horizontal part radius move of the vehicle and the pushing forces also vary accordingly. The loop made around the rings (1.18) by the strap and the self locking buckle (1.15) is used to secure the tight position of the two half bars or to get the haves closer to one another by pulling on the loose end of the strap.

It is also possible to use the ring (1.18) rings at the top of the car or at front bumper level as in the fourth arrangement.

The loop also allows the operation by only one operator when two are normally required

When the two halves are close together and fastened, it is possible to increase the move of the car by lifting the joined bars as for a standard bar, or if the halves are fastened, by continuing the horizontal move of the halves that are crossed beyond the central axis.

Lifting the bar gives more pushing force and crossing the bars optimises the move. It will therefore be possible to fasten the half bars in position with the loop and lift them instead of crossing them when the pushing effort is harder. Crossing the half bars will lead to an interference zone between one half bar and the other ones straps so that it is not possible to have the same move in this phase than within the previous one.

According to a tenth arrangement, the push bar is shortened in great proportion and is basically transformed into triangle with idler pulleys (5) at its ends (FIG. 12). The pulley changes the direction of the forces from the direction of the wheel straps (3.6) (parallel to the car axis and slightly upwards to a direction almost perpendicular to the car axis from the outside to the centre. These actions are symmetrical, and the pulling effort derives from the tightening effect on the straps ends of a tightener or winch (1.10) similar to the one in the 5° and 6° arrangements and. In this arrangement, the small element of the bar itself is only used as a bracing for the triangle structure and the triangle is only a support for the idler pulleys. The bar does not need to be lifted or to be rotation free in relation to the rear of the vehicle. If the trailer coupling device of the car cannot hold the torques generated, this can be managed by a strap fastened to fix point at the top (roof) of the car or by the shovel at the end of the short bar. The shovel will slide on the ground in spite of the added load due to the level difference between the bumper and the action on the connecting system (3 or 10).

According to an eleventh arrangement (FIG. 13), the bar and triangle are replaced by two rings (6) (fastened permanently, even during car manufacturing) mounted on a pivot or linkage (7) located at the rear of the vehicle as low as possible underneath the bumper and as close as possible to the axis of the wheels. The location is close to the main beams of the chassis, slightly on the outside. The dimension of the ring (6) straight part on which the strap runs is big and smooth in order to reduce the friction between ring and strap. Alternately this part is free to rotate.

In this configuration, a mere tightener or a winch connected to the loose end of the straps (3.6) coming from the connecting systems of each side of the vehicle will produce the pulling effort on the chains of blocs and therefore induce the pushing effort on the car where the forces change direction, at the level of the permanent rings (6).

Normally the move of the car is balanced on each side, but with the use of a mere winch (for instance a ratchet type (12)) this is not necessary, and in that case and in order to correct the unbalance it is possible to bloc one of straps to the car (trailer coupling) so that only the other strap will create a move. The blockage can also be done at ring level by introducing a rubber edge (provided near the ring location and fastened to the car body by a small cable) in the ring. This arrangement is best suited for the use of a double wind winch (8) that will automatically balance the move on both sides.

According to a twelfth arrangement, the bar and triangle are replaced by a winch (9) fixed on the trailer coupling system and pulling only on the front wheels straps. These straps (3.6) need to go under the vehicle. This is made easier by the use of a thin steel rod similar to the rods (3.1 and 3.2).

According to a thirteenth arrangement, a connecting system to the blocs (10) that does not need access to the inside face of the wheels replaces the connecting system with arched rods (3.1 et 3.2). It consists of two parts with edged surface, with length equal to the tyre width, kept parallel and joined together on their outside end by a length adjustable bar (10.1 and 10.2). The system is positioned on the wheel outer side, the rear edged part being connected by a set of rings or spigots (10.4) to the chain of blocs and the front edged part (10.2) being connected by a connecting ring (10.5) to the pulling strap (3.6). The distance between the two edged parts is adjusted by to the position of a pin (10.3) in one of the holes drilled in the inner sliding part of the adjustable bar telescopic system and according to the tyre size and depth of the wheel in the track. The adjustable bar and pin are designed to resist the stress during pulling phase.

According to a fourteenth arrangement (FIGS. 18 and 19), some ploughshares are added to the lower part of the blocs to increase the grip on the ground. These ploughshares can be fix (2.4) or articulated.

According to a fifteenth arrangement, the function of the chain of blocs is insured by a thick rubber strip with rough lower surface (2.6).

According to a sixteenth arrangement, a vehicle non return system (11) is added to the set of equipment. It is composed of a base plate (11.1) fixed to a lever (11.2) bottom end, the upper lever end (11.3) is hinged onto a chassis beam at the rear part of the vehicle. During a forward move of the car, the system will slide on the ground. During a backward move of the car, the lever pushes on the base plate and stops the move. Ploughshares (11.4) increase the efficiency of the non return system.

According to a seventeenth arrangement, the types of tighteners, manual and electrical winches used in the various arrangements can be switched.

That is to say that each arrangement can be used with one or any other type.

There are many tightening devices types. Models (8, 9 and 12) are only a few examples and any other adequate type can be used in place of those in the frame of the invention.

According to a eighteenth arrangement, the push bar systems and all their variations are also suitable for the vehicles with a number of wheels that differs from four, whether they are light or not. Sizes mentioned in the text are approximate and for reference and are to be adapted to each situation. Other adequate sizes are included in the frame of the invention.

INDUSTRIAL APPLICABILITY

The invention helps a vehicle getting released from a stuck situation. Road vehicles can venture on tracks that are usually restricted to specialised vehicles, and specialised vehicles can increase their capacity to deal obstacles. The invention allows people enjoy natural leisure and to increase their safety and independence on isolated tracks with means to react efficiently to a stuck situation. However, people should respect basic safety rules when driving on tracks.

The main applications are met when driving on sand, mud or other difficult tracks 

1/ Push bar for pushing a stuck vehicle designed to help a regular or an all tracks vehicle recover from a situation where its wheels are stuck in sand, mud, snow or any soft and slippery track, characterised in that it uses a bar to push the vehicle with the help of part of the vehicle weigh for the fix point, these almost fix points being realised by blocs positioned under the wheels and being anchored in the ground during the releasing operation, as well as the levered force of at least one operator, allows the setting of anti-skid systems around the wheels to prevent getting stuck again, is designed to be easily operated and stored in the vehicle trunk and is of acceptable volume and weigh, includes a set of elements to be assembled around the vehicle: a push bar (1) for pushing a stuck vehicle with its components: bar elements (1.1) made of hollow piping of manageable length, a triangle (1.2), connecting pins for the various elements (1.3), a connection system to the vehicle bumper (1.4 b) or to the trailer coupling device (1.4 a), the handles (1.5), a shovel (1.6), triangle end rings (1.7), a set of straps with corresponding buckles (1.9). four chains of blocs (2) that will be deployed during the release operation just in front of each wheel and will be anchored into the ground, constituting each a fix point in the ground under the vehicle load and a release track for the vehicle, and including blocs (2.1) with their connecting elements (2.2) that transmit the pulling force and maintain a flexibility between the blocs, allowing the various arrangements of the blocs during storage, operation, positioning and copy of the track profile and hooks or holes for spigots (2.3) to connect the connection system (3, 10) to the triangle; four sets of connecting systems of the blocs to the triangle of the bar, composed each of two rods (3.1 and 3.2), provided with spigots (3.3) on the blocs side and of a small locking bar (3.4) for hooking to the chain of blocs, and on the other side a spreader (3.5) for connecting the rod to the straps; four corresponding sets of webbing straps (3.6) with self locking buckles that can be of standard type (13, 14 a or 14 b) and hooks. 2/ Push bar for pushing a stuck vehicle according to 1 ^(st) claim characterised in that: the elements of the bar are made of profiles that can fit into each other for optimising the storage space, in particular, the triangle elements that are smaller could be stored inside the end of the bar elements at the operator side, them selves fitting inside the centre or vehicle side elements. 3/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the connecting system (3) that insures between the front and rear sides of the stuck wheel the continuity of the connection from the chain of blocs to the strap (3.6), is composed of two arched rods (3.1 et 3.2) with on the blocs side a hooked end or spigot (3.3) and a small removable connecting bar (3.4) to be connected to the first bloc, and on the other side the end ring of each rod is attached to a spreader (3.5) that insures the connection of the rods (3.1 and 3.2) to the straps (3.6), the assembly of the system consisting in laying the rods inside and outside of the wheel, the inside rod being dipped into he ground from behind the wheel to be recovered at the front, both spigots (3.3) being then hooked to the first bloc (2.1) and secured by the closing of the small bar (3.4) on the inside rod. 3/ Push bar for pushing a stuck vehicle according to previous claims, characterised in that: the triangle is tilted forward in order to increase the movement of the vehicle for the same lift of the bar as when the triangle is too tilted, the move over angle ratio decreases sharply, this optimisation is obtained when the triangle stays between −30 and +30°. 4/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: a ring (1.8) is added to the bar (1) between its middle and its back end to connect the bar to a fix point on the vehicle. This ring and fix point are linked by a doubled strap equipped with a self locking buckle (1.15). The arrangement is used to keep the bar in lifted position of for pulling. 5/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the triangle (1.2) is reinforced and the straps (1.9 et 3.6) run inside the triangle end rings (1.7). A tightener or winch (1.10) acting from the back end of the bar induces the movement while the bar will simply slide on its shovel (1.6). 6/ Push bar for pushing a stuck vehicle according to the previous claims characterised in that: the triangle (1.2) pivots inside a vertical guide (1.11) located next to the front side of the bar, immediately under the main bar element. The straps (1.9 and 3.6) are fastened to the triangle end rings (1.7). The action on the tightener or winch (1.10) located at the back end of the bar induces the move. The triangle can translate or can be secured by pins (1.12 a or 1.12 b) in the guide pipe (1.12) 7/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the straps (3.6) from each side go around the wheel of an idler pulley (4 a) attached to the triangle (1.2) and that their free end is fastened to a fix point on the vehicle structure. 8/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the idler pulley (4 b) is located at the end of the connecting system (3.5 or 10.5), one end of the straps (3.6) being fastened to the triangle end rings and the loose end going through the pulley wheel and then being fastened to a fix point of the car. 9/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the bar is divided into two halves (1.1 a and 1.1 b) free to rotate in a horizontal plane. Their respective back ends are provided with a ring (1.8) and a strap with self locking buckle (1.15). One half bars (1.1 b) is located slightly underneath the other one (1.1 a) and the horizontal element of its halt triangle (1.2 b) is located slightly above the other one's, its vertical element being open and with slightly bigger dimension than the other half triangle vertical element that fits inside and can rotate freely as soon as the open shape is closed by enclosing pins (1.13) or bearings. A vertical thrust is also added to this vertical element to stop any relative axial move. 10/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the push bar (1) is shortened in great proportion and is basically transformed into a triangle with idler pulleys (5) at its ends. The traction is induced by the pulling of the respective blocs connecting straps (3.6) at the level of a tightener or winch (1.10). 11/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the bar and triangle are replaced by two rings (6) mounted on a pivot or linkage (7) located at the rear of the vehicle as low as possible underneath the bumper and as close as possible to the axis of the wheels. A double wind winch (8) pulling the de straps (3.6) loose ends to induce the pulling of the blocs. The double wind winch is adapted for this arrangement. 12/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the bar and triangle are replaced by a winch (9) fixed on the trailer coupling system and pulling only on the front wheels straps. 13/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: a connecting system (10) will replace the connecting rods (3.1 and 3.2). It consists of two parts with edged surface(10.1 et 10.2) with a length more or less equal to the tyre width, kept parallel and joined together on their outside end by a length adjustable bar (10.1 and 10.2). The system is positioned on the wheel outer side, the rear edged part (10.1) being connected by a set of rings or spigots (10.4) to the chain of blocs and the front edged part (10.2) being connected by a connecting ring (10.5) to the pulling strap. The distance between the two edged parts is adjusted by the position of a pin (10.3) in one of the holes drilled in the inner sliding part of the adjustable bar and according to the tyre size and depth of the wheel in the track. 14/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: some ploughshares (2.4 or 2.5) are added to the lower part of the blocs (2.1) to increase the grip on the ground these ploughshares being fix (2.4 or articulated (2.5). 15/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the function of the chain of blocs is insured by a thick rubber strip with rough lower surface (2.6). 16/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: a vehicle non return system (11) is added to the set of equipment. It is composed of a base plate (11.1) fixed to its lever (11.2) bottom end, while its upper lever end (11.3) is hinged onto a chassis beam at the rear part of the vehicle. The lever lifts slightly and the plate slides on the ground during a forward move of the car, or on the contrary, it pushes the plate down to a blocking position during a slight backward move of the car. Some ploughshares increase the efficiency of the system. 18/ Push bar for pushing a stuck vehicle according to previous claims characterised in that: the systems and variants of the push bar can be used for vehicles having a number of wheels that differ from four, whether they are light or not, the dimensions have to be adapted to each situation. 